Argon vs Hafnium
| Property | Ar Argon | Hf Hafnium |
|---|---|---|
| Atomic number | 18 | 72 |
| Symbol | Ar | Hf |
| Name | Argon | Hafnium |
| Category | noble-gas | transition-metal |
| Standard Atomic Weight | 39.948 u | 178.49 u |
| Period | 3 | 6 |
| Group | 18 | 4 |
| Block | p | s |
| Phase at STP | gas | solid |
| Electron configuration | [Ne]3s23p6 | [Xe]6s24f145d2 |
| Oxidation states | [0] | [-2, 0, 1, 2, 3, 4] |
| Electronegativity (Pauling) | N/A | 1.3 |
| Electron affinity | -1 eV | 0.178 eV |
| Density | 1.7837 kg/m³ | 1.330000e+4 kg/m³ |
| Melting point | -189.35 °C | 2232.85 °C |
| Boiling point | -185.85 °C | 4602.85 °C |
| Discovery year | 1894 | 1911 |